What do you mean by "change the langauge titles"?
If it has something to do with app names and descriptions, sadly the developer has control over that, not Apple or the iPhone. If, say, the description is in French and you want it in English there's nothing you could do really.
This is not my first iPhone and I also have an iPad...the iPad app store is the same as the langauge set on the iPad ....my iPhone however is set to English and the app store/iTunes is in Japanese. That my problem! I can't change the langauge to English.
Omg!....I finally got the langauge to change in the app store..1> setting 2> store 3> clicked on Apple ID sign out 4> create new Apple ID 5> confirm your country or region.. Here is where I got to change the langauge ,,next,,,agree and close. 6> open app store and use existing Apple ID. Thank you for your help.